From: Victor Colombo <victorcolombo@xxxxxxxxx>
This patch adds the IIO_CHAN_INFO_SCALE mask to ad2s90_chan and
implements the relative read behavior at ad2s90_read_raw.
Signed-off-by: Victor Colombo <victorcolombo@xxxxxxxxx>
---
drivers/staging/iio/resolver/ad2s90.c | 32 ++++++++++++++++++---------
1 file changed, 22 insertions(+), 10 deletions(-)
diff --git a/drivers/staging/iio/resolver/ad2s90.c b/drivers/staging/iio/resolver/ad2s90.c
index b4a6a89c11b0..52b656875ed1 100644
--- a/drivers/staging/iio/resolver/ad2s90.c
+++ b/drivers/staging/iio/resolver/ad2s90.c
@@ -34,19 +34,31 @@ static int ad2s90_read_raw(struct iio_dev *indio_dev,
int ret;
struct ad2s90_state *st = iio_priv(indio_dev);
- mutex_lock(&st->lock);
+ switch (m) {
+ case IIO_CHAN_INFO_SCALE:
+ /* 2 * Pi / (2^12 - 1) ~= 0.001534355 */
+ *val = 0;
+ *val2 = 1534355;
+ return IIO_VAL_INT_PLUS_NANO;
+ case IIO_CHAN_INFO_RAW:
+ mutex_lock(&st->lock);
+
+ ret = spi_read(st->sdev, st->rx, 2);
+ if (ret < 0) {
+ mutex_unlock(&st->lock);
+ return ret;
+ }
+
+ *val = (((u16)(st->rx[0])) << 4) | ((st->rx[1] & 0xF0) >> 4);
- ret = spi_read(st->sdev, st->rx, 2);
- if (ret < 0) {
mutex_unlock(&st->lock);
- return ret;
- }
- *val = (((u16)(st->rx[0])) << 4) | ((st->rx[1] & 0xF0) >> 4);
-
- mutex_unlock(&st->lock);
+ return IIO_VAL_INT;
+ default:
+ break;
+ }
- return IIO_VAL_INT;
+ return -EINVAL;
}
static const struct iio_info ad2s90_info = {
@@ -57,7 +69,7 @@ static const struct iio_chan_spec ad2s90_chan = {
.type = IIO_ANGL,
.indexed = 1,
.channel = 0,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
};
static int ad2s90_probe(struct spi_device *spi)
--
2.18.0
